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Patented fiept. 4, i023.

san stares DENNIS A. (EA-E3, OF NEW GB'LEANE, LGUISIANA.

nrroraanous rarxrtfifi 7 30 Drawing.

10 ous mixtures and the essential diii'erence be tained on a #10 mesh standard la oratory sieve, 50%.

However since it is difficult for any asphalt plant to roduce a mixture which would contain ite exact amount of coarse aggregate with the exact grading required as just mentioned and as imitations may be produced by varying slightly the quantity and grading, I have found that the bituminous mixture should contain from 44 to 59%% of coarse'aggregate graded in size as specified hereafter.

The method of manufacturin this mix ture and placing the same on t e street is the same as that employed with other bituminous mixtures of similar nature, except that this mixture does not require a seal 40 coat or squeegee coat as is required in placing other coarse aggregate mixtures. The general formula for this bituminous mixture is outlined as follows.

By Weight. Bitumen 5%70 to 8.5% Filler 4% to 6% Fine aggregate 31% to 41% Coarse aggregate"- 445% to 59%}70 The bitumen may be either asphaltic, semiasphaltic, coal tar or water gas tar.

The filler may be of any impalpably fine Application flied October 7, 1921. fieriai tic. 508,092.

powder, not soluble in water, and which. shall pass through a- #200 mesh standard laboratory sieve.

The fine aggregate may be sand-or stone particles or a mixture therefrom, all of which-shallpass through a #10 mesh standard laboratory sieve but shall not pass through a #200 mesh standard laboratory sieve.

The coarse aggregate may be either gravei, crushed rock, stone or slag which. shall be graded as follows ing.

sieve having #11 inch circular openings! From 25% to shall pass a are inch circular opening and be retained on a #& inch circular opening. 7

From 25% to 75% shall pass a #5 inch circular opening and be retained on a #10 mesh standard laboratory sieve.

Having thus described my invention what I claim as new is a 1. A mixture consisting of 5%?) to 811 9;; by weight of bitumen, 4% to 6% of a filler, 31% to 41% of a fine aggregate and to 59%% of coarse aggregate.

2. A mixture consisting of fit-70 to of bitumen, 4% to 6% of a filler. 31% 41% of a fine aggregate capable of passing through a #10 mesh standard laboratory sieve but not through a #200 mesh standard 100% shall pass a #2 inch circular opera,

Not more than 8% shall be retained "one" iii laboratory sieve, and 44s}% to 59. 27? of-a 85 in presence of two witnesses.

DENNIS. A. CASEY.

Witnesses:

En. H. DONLON, J. E. Mrromn.

in testimony whereof I aflix my signature 

